Service cabinet



Feb. 9 1926. 1,571,988

' I A. H. WOODWARD: Y

SERVICE CABINET Filed July 2, 1923 5 Sheets-Sheet I MW W Feb. 9 1926.571,988

Y A. H. WOQDWARD SERVICE CABINET Filed July 2, 1925 5 Sheets-Sheet 5Feb. 9,1926. 1,571,988

A. H; WOODWARD SERVICE CABINET Filed July 2, 1923 5 Sheets-Sheet 4 Feb.9 1926. 1,571,988

A. H. WOODWARD SERVICE CABINET Patented Feb. 9, 1926.

PATENT orrice.

UNITED STATES ARTHUR H. woonwaanon cnrcaeo, ILLINOIS, Assfe oR ToINTERNATIONAL REGISTER co, or cnfcneo, rttrnors, A o0Rro AT I0N orILLINOIS.

sn'nvron Application filed July .2,-

Cabinets, of which the following is a full,

clear, concise, and exact description, refcrence being had to theaccompanying draw-.

ings, forming a part of this specification. My invention relates toSBlVlCG. cabinets,

0f the general type disclosed in United States patent to Matchette No.1,222,965, April. 17 1917, whether such cabinets be mounted in a door,or in a stationary wall forming part of an enclosure.

One object of the invention is to eliminate the possibility of pilferingor accidental or intentional faulty operation of such a cabinet.

Another object is tocompletely eliminate the additional risk of theft orbreakin in, involved in the installation and use of service cabinets.Stated in another way, this object is to reduce the easiest means ofsecuring accessto a house, apartment or other analogous enclosure toaccess through some other opening thantlie service cabinet.

Another object is to provide a simple and effective interlock forservice cabinets.

Another object is to put the interlocking mechanism near the hinges ofthe doors of the cabinet. f g 1 Another object is to diminish the numberof springs required. 7

Another object is to provide simplified signals and operating meanstherefor.

Another object is to provide an improved linkage forflimiting theopening movement of a door.-

Further objects and advantages of the invention will become apparent asthe descrip: tion proceeds. T

in theaccompanying drawings? Fig. l is-a front elevation of a servicecabinetaccordingto my invention, with the doors closed;l l

Fig. 2'isacentral section on line 2-2 of Fin. c: f y

3-3 is a section on line 3-8 of 1; .Fig. dis a horizontal section online l4l ofFig. 1; Fig. means; 1

Fig. fi-isa ide elevation of the shift slide;

a detail section of the signaling CABINET.

1923. Serial No. 648,886.

cabinet with one door thrown wide open;v

Fig. 8, is a horizontal section of the locking mechanism on line..88 ofFig. 11;.

Fig. 9 is a detailed section online 99 of Fig. 2, showing most of theinterlock in elevation; I

Fig. 10 is .a horizontal 101O of Fig. 9; i

Figs. 11 and 12. are vertical sections on lines 1111 and 1212 of Fig. 9;and

Fig. 13 is adetailed horizontal section on line 13.1 3 of Fig. 1.

In the embodiment of my invention selected for illustration, the cabinetitself is formed entirely of material not affected by moisture, such asmetal, bakelite, or Waterproof fibre. This is importantbecause suchcabinets are frequently exposed to the weathe'ron one side only, andthis exposure, especiallyincombination with the wide temperaturedifferences frequently obtaining between opposite sides of the cabinet,makes the best ;of Woodwork construction quite unreliable andunsatisfactory.

.Metal cabinet.

Lightness is, of course, always essential in any type of construction,and I therefore provide in the metallic construction, a completeskeleton framework of structural shapes, and a sheathing or covering ofsheet metal thick enough not to dent easily, Which covering incidentallyreinforces the skeleton framework, and materially contributes to thestructural strength of thecabinet as a Whole.- Although, standing alone,the I or H section is the most efficient, when a combination of platesand structural shapes is relied upon for rigidity and strength, thechannel section, is most efficient, and even an angle section is betterthan an I section. Accordingly, the outer door '10 and inner door 12 ofmy improved cabinet are each built up of a channel iron frame It extending around the periphery of the door and section on line'preferablycurved adjacent the corners at 16, to form a substantiallysquare frame receiving the sheathing 20, Thissheathing is furtherstiffened by providing inset panels 22 in the'center ofeach door. I

The remaining. walls of the cabinetarc built up of angle iron 24 andsheathing 26. Exce pt atv the dooi -hinges the leg ofthe angleperpendicular to the plane of the closed Ill) door projects out ard, sothat a shelf or recess is formed within which the door can nest. Anysuitable wall structure 28, either stationi'iry or forming a portion ofa door, engages and supports the cabinet in any suitable ay.

The pintles 30 for doors l0 and 1:2 are preferably placed at the sameside of the cabinet, and each door carries adjacent its pintlc,connections for operating the interlocking mechanism and for positivelyinsuring complete and correct functioning thereof at all times. For thispurpose latch bars 32 extend diagonally across each door, terminating attheir outer ends (see Fig. 13) in latches 3-iotl'set from the plane ofthe rest of the bar by an offset 86. The bar slides through a slot inchannel ll, and carries :1 lug to contact the web of channel letandlimit the latching movement. A hook l2, or other suitable projectionextends outwardly from the latch bar through a slot sit) in panel 2:2for manual operation of the latch bar to open the door. As the latch barand panel lie in contact with each other (see Fig. 3) the latch bar atall times closes that portion of slot it) not occupied by hook letainersl-l (see Fig. 125) comprises an inclined portion. terminating in alevel. portion of appreciable length. This causes the latch bar to beforced back, and then held back for a dei'inite distance of movementbefore it snaps into the position shown in Fig. 13.

Referring now to Figs. 9, 1t), and 11, each latch bar 32 enters a casing1-8 and slidabtv received in a. suitable slot in the bight of a U shapedsupporting plate 50 bolted on channel ll; as at (see Fig. 10). A.compression spring til, bearing against bracket 5t) and a plate 56 heldby pin 58, normally resiliently urges the latch bar into latchingposition.

Interlock.

The primary function of interconnecting the two latch iars so that onlyone of them can be withdrawn at a time, is performed by a bolt 60,slidable to and fro to selectively obstruct the movement of the latchbar; and the secondary function of shifting this bolt each time a door.is closed to lock said door closed and permit subsequent opening of theother door only, is performed in'imarily by a shifter 62 slidable to andfro parallel to bolt 60. The rear, or hinge, end of each latch bar isbifurcated to form a blocking point Get on the same level as bolt 60,and a shifting cam 66 on the same level as shifter 62.

A lost motion connection between shifter ($52, and bolt 60 is provided.comprising lever 68 pivoted at 70 on a stationary pintle, and carryingpin '72 entering a suitable slot in shifter 62. At its lower end asimilar pin 7% enters a notch 76 in bolt 60, which notch is elongated asclearly shown in Fig. 9 to provide a lost motion connection between theshifter and bolt. lliasing means for the shifter is provided comprisinga compression spring 78 bearing against .a lug 80 bent out of the mainsupporting plate 82, to urge plunger down and rock ratchet lever 86about pintle 70. Economy in construction is attained by pivoting levers68 and 86 both on the same pintle, and designing the parts so thatproper operation can be ob tained with such mountii'ig. Shifter 62carries a block 88 lying in the plane of lever 86 and provided with atriangular point 90 adapted to ride over a. similar point 2):! on theend of the lever.

With the parts in the positions shown in 9 and lo door it) can beopened. but door 12 is locked or the projecting end of bolt 60. Meansare provided for postponing the shifting of bolt (it) to permit the nextopening of door 12 until after door 10 has been opened, closed, and itslatch bar has moved past the point of locking engagement with detent iiiand is itself loclrcd against withdrawal from said detent. 'llhe samcstrip 9stcarrying bushing 96 (see Fig. ll) for the door pintlc 08, hasan inwardly projecting ear hit), to which is pivoted one end ofdrac'linl; 102. The other end of the dragrlinlr carries a flanged rollerltlal slidable transversely across the cabinet in a slot 10a in ahorizontal shelf 108 bent forward at the upper edge of the main supporting plate .lelow plate 108 ears lit) at the end of plate support acombined pintlc and cover retaining bolt 11,2 carrying a sleeve flat. rirocking plate 116 pivoted. on pintle 'llB by means of cars llb at itsends, carries at one end a depending arm 120 termimiting in a lockingprojectioirl ifl adapted to enter either one of two apertures litlprovided for the purpose in bolt (30. The upper edge of plate llti isturned over just under shelf 108 to form a cam 126 projccting partlyinto the path of roller I 'll: all acro the cabinet except at theextreme ends at till.

Duplicate equipment is provided for door the position shown in Fig. 10,withdrawal 1 of the latch bar for door 10 to open the door will firstcam the shifter 69. to the left, through a trifle more than half itsrange of movement, carrying the tip of point 90 a trifle past the tip ofpoint 92 so that spring ltll] 78 now tends to complete the shifting'ofthe parts. Further movement of the shifter is prevented by engagement ofpin 74 With end of 1 slot 76, bolt itself being prevented from. furthermovement to the right by toe 6d of the latch bar, which hasmoved backdirectly across itspath. Door 10 must be moved far enough to carry latch:34 past part 46., before the latch bar can move forward again where itwill nolonger obstruct movement of bolt 60. Appreciably before thisamount of movement has occurred, rolldown slot 106. and cam plate 116over to Drove locking projection 122 into the right hand aperture 124.As soon, therefore, as door 10 is tl'irown open and latch bar 32 removesits toe 6 1 from or 104% willv move the path of bolt 60, lockingprojection 122 the outer door, can now deposit or remove articles fromthe cabinet. After this is done door 10 is again closed. During thismovement the sequence of operation Will be as follows: First, latchbar32 will be pushed back by inclined surface 44 far enough to bring toe64: in front of bolt 60; second, roller 10-1: will come into registerwith its notch in cam 126 and locking projection 122 will be withdrawn;third and fourth, hoolr' will pass the inner edge of detent 18, thelatch bar snapping into place, withdrawing toe 64: from the path ofbolt-'60, which bolt it ill immediately slip over into the path of toe64, so that the latch bar cannot again be withdrawn; fifth, thecompletion of. the movement of bolt 60 will carry it far enough toremoveits other end from the path of the other toe 6 1, thereby unlocking'door12. I

This fifth function, release of door 12, is the one which must renderedimpossible of performance by any m'roneous manipulation or defectiveoperation of the device. During the sequence of operation the functionof preventingthis is pcrforned by two different agencies, andtransferred from one agency to the other and back stance a definiteoverlapping, much larger than any possible errors in construction, adj1611i; or isial'llpillgllltill. There isvno tendency to shiftbolt. 50until after toe (i-l has moved infront of it to obstruct its path, whenth completion 0 the movement ;..fter 62 past its center posie cannotmove out of the path d until after roller 104 has moved projection 122into "place. lVhen without fail be again, but there IS in every inet go158 of the interlock casing 160.

or 104 permits locking projection 122 to be withdrawn. Latch 3 1 has toenter behind detent 4-6 before toe 6 1 is moved clear of the path ofbolt 60; and, finally, bolt 60 will move into the path of toe 6 1 beforeits other end will move clear of the corresponding toe on the otherlatch bar.

Signalling means.

1 Inside each casing 48' and mounted on sheathing 20, (see Fig. 5) is aplate 131 provided with a central aperture with off set e lges toreceive a transparent cover 182, and end. lugs 15% forsupporting apintle free'swinging movement on pintle 136 by 'means of cars 140 andcarries a lateral proection 14-2 forming with plate 138, two sides of aregular polygoncentered about pintle 136. A pin 14% projects from one ofthe ears 1&0 through a suitable slot in lug 134- into the path of aprojecting arm 1 16 on a single operating plate 148 carried by A smallerplate 138, is pivoted for shifter 62. Upon reference to Fig. 5 it willwill be released tofall under the force of gravity from the dotted lineposition of Fig. 5. to the full line position and change the indication.closed and locked, the signal in the inner door will be changed toapprise persons on the inside of that fact.

Each signal, of course, carries suit-able indicia in the usual way forindicating the locked or unlocked condition of its door Furthermore,each name plate138 will indicate the unlocked condition of the door, andeach lateralprojection 142 the locked position, so that the indicatingplates themselves are complete duplicates.

Safety.

Bolt 60 and shifter (32 are guided in sliding movement by contact on oneset of faces with the edges of win 's150 bent forward from the sideofthe sin supporting plate 82; and on the other side by lJ-shaped strips1152 held in place by the same screws 15 1 emplyed to fasten plate 82 inplace. The two lower screws 15%. also iasten ears 156 defining a slotfor receiving the upturned This casing is slipped up into place and, asshown in Fig.8, fastened tl ere by bolt 112. It is preferably bent outto form smallridge's 162 lying close to the head of bolt 112 andretaining nut 168 to prevent said bolt and.

lVhen door '10 is finallywill he evidenl. that 1 operation hereinahovedencril nl should alao he horne. in nnnd. n. will he, ap areal ihallhe-re is: no lnne l'ael'or in any alep. and that Where conlinnify oifunction in ei-renlial the Hilfilhi overlap, each step hegrinning;iieliore lhe lIU'QL'LilIlljJ step ends; whereas where diseontinnihv iseseential ihe two slopes required to he dinconlinnone. a arranged sothat the second atop does not. heg'in until after The first etc has goneso far thal il; cannol' he Hopped. 'l hns. on opening. projection i532comes in'lo action before too (l-l rendered inope'alii'e. and on fflOItoe. 6% becomes operative before projec in Willidrawn. Sii'nilarlv hefinal aimlio g movement of holl: cannot begin nnlil a'lil'er dei'enlieiG lo el'feciivel engaged, and cannot continue Without locking l'hoouter door ll) helore releasing the inner door 152.

Door (7! eeli.

Dranlinhn 1013 and 128 ierl orni an important lion-lion 1n addnion l'oconljrolhng the inreiaoclr. lle'l errino to liar-is. -.l.- 7 and 3 ll.it will be seen that each hnlr coin lllSOS l wo porlionshenc To an angleonly slighll leaa lhan i l) de greee. inalead of extending; relraiahifrom one pirol' to the olher. For purposes ol discussion. llill'; willhe considered as comprising a doorcngraging porlillll lllland awail-enga 'nng portion hill.

The openingmovement of door 12 will roial'e the entire link in aeloclui'ise direexion and hrinn pori'ion 16 into parallelism with strap91- and door and portion llo ini'o parallelism \ril'h lhe side wall oi"ihe calvinel'. 'lhe ellion' joining; lhe lin'o poriions will he. movedin a paih going anhahniliallv to pile Eh Jal. so ihai' alien l reresneclire lltll'l'ldit? do main: ronlacl' will: lhe doo and wallrerxpiaiirelv. lhe linl: liiniia iinrl'her opening: oieneol of ihe door.'lhia liiniljal'ion is .iposed h}? en J;e.1:a;-ni at. Hvo poinl'a raalefrom lhe pinlle on opposite aides. and l one or lava p :inls eloe inThe. pinlle. -1) hal hear loada can he n'ilhoa. overa lraining; iheparla. will he appan enl i'l at h carnairng: lhe ang nilarihv oii' {helive porliona. any desired. angle oi oponin herinilled door 'oiihoni.rel f on any exiern cheel: lo slop iia 'l hna ii l'hc i inet is to he indied ii; a cerner \i'here door 112 can onl he opened Ell.) degrees,linl; should be approximately maroon .al'raighl. to limit the openingniovenicnl' oli (he door, without letting il' hil the Wall. To adapt theindividual cabinet for namnting in all sorts of positions. it is onlyneeeeeary to carry a few ext'a draglinks of dill'orent angnlarity instock, all the rest of the nieehaninn'i remaining enlirel unchanged.

An additional advai'ifage of this type of construction, is that theineinl'ier limiting the opening movement of the door lie. out of the Wayclose lo he door and side wall of The cabinet when the door is open,instead of OXlQIlCllHQ' diagonally across the angle hetvveen lliein, asthe ordinary lensan'i la'ace does. l nr'heianore. therein no limit tothe angle oi? opening at which the door can he successfully hraccd, aslhe door can readily be designed to swing open through, conside-rahlvmore than 180 degrees. A. tension i zaee cannot operal'e with dooriiapenings snhe iantially less; than 180 degreet. ll ithout furtherelaboration, the foregsgoine will so fully explain the grist of myinvention, that others may, by applying cnr rent knowledge. readilyadapt the, same for one under ariona conditions of service, wil'honlieliminatiinr certain features which may properly be said to constitutethe essential items of novelty involved. which llClllS are intended tobe defined and SGClllLfl to me hv rho following claims.

1. In cijmihinal'ion. a compartment, a phlralil'v of doorsloperniil'liing aceees to The interior of Said c1anparlai'ienl, lockingmeans; for each of said (iota-a. delenl'; means; for engaging each olsaid locking means. said delenl means helm: loral'ed adjaccnlvthe doorhinges and en aging one of said locliii'in' means at all limes, andacl'uai'ing' n'ieana lor canning, said delenl means to engage a dililerenh one oi? said locking means at each actuation.

l n mnhimilgion. a compartment having a plum lily of penings permittingaccess to lhe interim. lhcreol, doora for cloning Said. openings.locking: .i'neansi For each of said. doors, delenl meansv adjacmd the.door lllllfijlfs lor engagii1; said locking means one at a line toprevent [he opening); (Xi: lhe corre spending door. aaid delenl nieanaalways relainine; one oi said doors cloned. and signal nieana l or eachone ol' aaid doors. said signal nzeana operalral h v said delenl meanslo indirain Which of the doora may he in'ilocla-d.

il. in conihinalion. a rahinel. a door for aid cahiinl. a laich law Foraaid door. a holi; zaljaeei'ili the door hinge ei'igaging said lalch harl'o prevcni' l'he iialocliingzj o'l said har. a Hecond door. a latch barfor said second door, aid lalier lal h. liar ()llll(f)lllll{l' thedisenl diahid 'inein of said holli.

l. in 1nhination, a con'ipartnient, a door "a latch and latch bar forsaid door, detent means remote from said latch operated by movement; jotsaid-latch bar tothelocking position for engagingsaid latch bar andpreventing wi l'idrawalthereof, a signal operated by said detent means,a second door,

a latch and latch bar for second door,

said second latch bar causing disengagement" of sai detent means fromsaid first'latch bar. Y

5; In con'ibinatioin two doors, latch and retainer means for eachdoor,-a locking obstacle -movable to selectively obstruct withdrawal ofsaid latches at points remote from said retainer, and connectionsoperated byeach latch for locking sa'd latch and unlockmg the otherlatch.

6. In combination, two doors, a latch and retainer means for eachdoor, alocking ob stacle movable to selectively obstruct Withdrawal or" saidlatches, and connectionsremote from said retai er operated by each latchfor locking said latch and unlocking the other latch; I

s. In. combination, door, latch and retaincr means for said door, alocking ohstacle remote from said retainer means, and connectionsactuated by said latch for moving said obstacle to lock said latchagainst further actuation. p

8. lircombination, a door, latch and retainer means for said door, alocking obstacle, and connections remote from said retainer meansactuated by said latch for moving said obstacle to lock said latchagamstfurther actuation.

9. In combination, a door, latch and retainer means for said door, alocking ob stacle, shifting means, connections for actuation of saidshitting means upon withdrawal ofsaid latch to open said door, and meansfor preventing said "shifting ineans from acting until said door isclosed. and said latch has engaged said retainer, said shifting meanswhen released moving said locking ol'istacle to lock said latch. I

10; In combination, two doors, an interlock between said doors, a-casingenclosing and protecting said interlock, retaining means for said casingwithdrawable only when one door is open,-and fastening means for saidretaining means accessible only when the other door is open. p I

11.1n combination, two doors, intcrloen ing means for said doors, casingmeans en 1 closing and prot cting said interlocking suchshittingwhenever said door. is farther from closed position than saidpredetermined displacement. j 13. In an interlock,;two doors, a latchbar for each door, an interlocking element movable to selectivelyobstruct withdrawalot said latch'bars, means actuatedby withdrawal ofthe unobstructed-bar tending to shift said element, and means to preventsaid shitting when either door is not completely closed, said preventingmeans including two differcntdisplacement sensitive means operatingthroughout overlapping displacements.

lei/In an interlock, two doors, a latch bar for each door, aninterlocking element movable to selectively obstruct withdrawal ofsaidlatch 'bars,;-m eans actuated bv withdrawal of the unobstructed bartending; to

shift said element, and meansto prevent said shifting when either dooris not completely closed, said preventing means including two differentdisplacement sensitive means operating throughout overlappingdisplacements, one of said displacement sensitive means comprising' saidlatch-bar itself. i I

'15, In an interlock, two doors, a latch bar' fo'reach door, aninterlocking element movable to selectively obstruct withdrawal of saidlatch bars, means actuated by with-- drawal of the. unobstructed-bartending to shift said element, and means to prevent said-shifting wheneither door is not com pletely closed, said preventing means includingtwo different displacement sensitive means operating throughoutoverlapping displacements, one of said displacement sensitive meanscomprising said latch bar itself and means forholding it in the path ofsaid element throughout predetermined door displacement." I 16." .lnan'interlock, two doors, a latch ba for each door, an interlockingelement movable to selectively obstruct withdrawal of said latch bars,means actuated by withdrawal of the unobstructed bar tending to shift.said element, said element being obstructed from shifting by said latchbar throughout a predetermined door displacement near closed position,and independent means for obstructing said element throughout adisplacement beginning'within said first displacement and including allopen positions therebeyond.

17. In an interlock, two doors,.a latch bar for each door, aninterlocking element movable to selectively obstruct withdrawal ofsaid-latch bars, means actuated by with-.

pm lid drawal of the unobstructed bar tending to shift said element,said element being obstructed from shitting by said latch bar throughouta predetermined door displacement near closed position, and independentmeans for obstructing said element through out a displacement beginningwithin said first displacement and including all open positionstherebeyond, movement of said latch bar into latching position after thedoor. has been completely closed releasing said element.

l8. In an interlock, two doors, a latch bar for each door, aninterlocking clement inorable to selectivcy obstruct withdrawal of saidlatch bars, means actuated by withdrawal oi: the unobstructed bartending to shift said element, said element being obstructed 'l'romshitting by said latch bar throughout a predetermined door displacement.near closed position, and independent means for obstructing" saidelement throughout a displacement beginning within said firstdisplacement and including all open positions there/beyond, movement ofsaid latch bar into latching position after the door has been completelyclosed releasing said element, and sinniltancously locking said latchbar.

19. In combination, a door, a latch bar carried by said door, a lockingelement, said bar and element being mounted to slide into a commonspace, whereby movement of one into said space locks the other out, andmeans actuated by sliding said bar into said space for sliding saidelement into said space when said bar is withdrawn.

20. In combination, a door, a latch bar carried by said door, a lockingelement, said bar and element being mounted to slide into a commonspace, whereby movement of one into said space locks the other out,means actuated by sliding said bar into said space for slidingsaidelement into said space when said bar is withdrawn, and means for preventing sliding of said element when the door is not closed.

21. In combination, two doors, a latch bar carried by each door, alocking element, one part of said locking element and one part of onelatch bar being positioned to slide into and out of the same space,whereby they mutually lock each other out of said space, and anotherpart of said locking element and a part of the other latch bar beingpositioned to slide into a different space, said locking elementoccupying one of said spaces at all times to prevent simultaneouswithdrawal of said latch bars.

22. In combination, two doors, a latch bar *arried by each door, alocking element, one part of said locking element and one part of onelatch bar being positioned to slide into and out of the same space,whereby they mutually lock each other out of said space, and tlHOlIllGl'part of said locking element and av part of the other latch bar beingpositioned to slide into a dillerent space, said locking element occuiying one of said spaces at all times to prevent simultaneous withdrawalof said latch bar, and means for shifting the element upon actuation ofone latch bar to lock said bar and release the other one.

23. In combination, two doors, a latch bar carried by each door, a.locking element, one part oi said locking element and one part of onelatch bar being positioned to :lide into and out oi the same space,whcrcby they .nintnally loch each other out of said space, and anotherpart of said loclt inn element and a part oi the other latch our beingoositioiwd to slide into a dillerout space, and means tor shitting saidclcment to prevent simultaneous opening of said doors.

24. In an ii'itcrloclt, an interlocking elewent, two latch membersintcrloclnid there by, said element and members mutually obstruclingmovement oi each other into two spaces remote from the latch ends ofsaid members and common to the path of movement oi said element and eacho't said members respectively.

25. In an interlock, in interlocking element, two latch membersinterlocked thereby, said element and members mutually obstructingmovement of: each other into two spaces remote from the latch ends ofsaid members common to the path of movement of said element and each ofsaid members respectively, said element occupying one of said spaces atall times.

26. In combination, two doors, an interlock preyenting simultaneousopening'of said doors, latches for said doors, means operated bywithdrawal of said latches for perating said interlock, and meanssensitive to door displacement tor postponing interlock operation wheneither door is open.

2?. In combination, a pivoted door, locking means for said door, andcontrol means sensitive to door displacement governing the action ofsaid locking means, said con trol means including a linl; pivoted tosaid door remote from the door pivot.

In combination, a pivoted door, looking means For said door, and controlmeans sensitive to door displacement governing the action of saidlocking means, said control means including a link pivoted to said doorremote from the door pivot, and cam means actuated by the other end ofsaid link.

29. In combination, two doors, an interlocking element shittable toselectively prevent opening said doors, a shifter, spring biased out ofan intermediate position,

Stl

arissa mediate position, a lost motion connection between said shifterand element to permit said movement, and means affected by the positionof the door for preventing the final movement of said shifter andelement until the door has been closed. I

30. In combination, an'interlo-ck bolt, an actuating slide, a pivotedlever connecting said siide and bolt, spring biasing means for saidslideincludinga pivoted pawl, and

a single pivot for said lever and pawl.

31. In combination, two doors, latches therefor, an interlocking elementassociated with said latches, means actuated'by opening one door tendingto shift said element to lock the door last opened, an obstruction forpreventing shitting or said element, and

means positively holding said obstruction in operative position, Whilethe door is'open.

32. In combination, two doors, latches therefor, an interlocking elementassociated with said latches, means actuated by opening one door tendingto shift said element to lock the door last opened, an obstruction forpreventing shifting of said element, means positively holding saidobstruction in operative position While the door is open, and

means for resiliently Withdrawing said obstruction a ter the door hasbeen closed.

38. In combination, a pivoted door, locking means for said door, and camcontrol means sensitive to door dispiacemcn for controlling the actionof said locking means,

said control means including a movable cam mounted independently of saiddoor, and a cam actuating device operatively associated with said door.

V 34, In a service cabinet, in combination, doors, latches for saiddoors, and interlock ing mechanism between said 1atches,said

1 mechanism including a shifter actuated by said latches, a l ckingelement, and a lost motion connection between said shifter and element,V

35.In a service cabinet, in combination, doors, latches for said doors,and interlocking mechanism between said latches, said mechanismincluding a shifter actuated by said'latches, a locking element,a lostmotion connection between said element and shifter, and spring biasingmeans operating on said shifter.

In Witness whereof, I hereunto subscribe my name this 29th day ofJune,1928.

ARTHUR H. WOODWARD.

